Ivalvu eshiselwe i-diaphragm yezinga lokudla ilawulwa ukude idivayisi yokushayela noma isetshenziswa mathupha ngesibambo.Idivayisi yokushayela inamazinga amathathu: uhlobo oluvamise ukuvaleka, uhlobo oluvame ukuvuleka kanye nohlobo lwegesi.Inezinzuzo zesakhiwo esilula, ukubukeka okuhle, ukuhlakazeka okusheshayo nokuhlanganiswa, ukusebenza okuguquguqukayo, ukumelana noketshezi oluncane, ukusetshenziswa okuphephile nokuthembekile, njll. Ifanele ukulawula kwamanzi, igesi, uwoyela kanye nemidiya egqwalayo embonini yamakhemikhali, i-petroleum. , i-metallurgy, ukufudumeza amanzi, ukudla, izimboni zemithi nezinye.